Portable pneumatic grease gun



Nov. 3 1925. 1,559,894

c. BL LANSlNG PDRTABLE PNEUMATIC GREASE GUN 'Filgd Dec. 25. 1-924C.5.Ln-sma MW IATTORNEYS a pneumatic Patented Nov, 3, 1925.

UNITED STATES PATENT OFFICE.

PORTABLE PNEUMATIC GREASE GUN.

Application filed December 2 To all whom it-mag concern: I

Be it known that I, CHAnLEs BnInonN LANSING, a citizen of the'UnitedStates, and a resident of Colorado Springs, in the county 6 of ElPasoand State of Colorado, have invented a new and useful Improvement-inPortable Pneumatic Grease Guns, of which the following is" a full,clear, and-exact description. 1

My invention relates to improvements in pneumatic grease guns, and itconsists in the combinations, constructions, and ar-' rangements hereindescribed and claimed.

An object of my invention is to proyide grease gun of the characterdescribed by means of whichgrease initially passed into a conductingpassage is forced, underpressure, through said passage and i into agrease cup -'or the like with which 20 said passage is adapted. forconnection.

A further object of'my invention is to provide a-pneumatic grease gun ofthe character described by means of which the amount of grease,forced'into the grease cup or. grease passage may be accuratelydetermined.

A further object of my invention is to .provide a grease gun of thecharacter described by means of which great force. may j be applied tothe grease,'thus assuring its movement to remote portions of the bearingor mechanism sought to be lubricated.

Afurther object of my invention is to provide a pneumatic grease gun ofthe character described which may bereadily refilled withoutdisconnecting the gun from the source of air supply.

' A further-object of my invention is to provide a pneumatic grease gunof the.ch:ir aoter described which. is light in weight,

durable, and which is thoroughly practical for the purpose intended.

Other objects and advantages will appear in the following specification,and the novel features of the invention will he particularly pointed outin theappended claims.

y invention is illustrated in the accompanying drawings forming part ofthis ap-' plication, in which 4 .Figure 1 is a sectional view throughanembodiment of my invention, and i Figure 2'is a viewof the meclranismillustrated in Figure 1' with theair valve open,"

as. in operation.

In carrying out my invention I make use of a grease containing cylinder1 having a -.ure 1.

s, 1924. Serial No. 758,211.

piston 2 mounted for reciprocation therein. The cylinder 1 has aremovable threaded plug 3 which serves outer end of the cylinder. isprovided with" a may bereadily and removed from the cylinder;

. The piston 2 isprovided with a push rod 5 which is and provided with ahand This closure 3 projection 4 by which -'it grip 6 at the as aclosure. for the projected through the plug 3' gripped with the wrenchoutermost-end thereof by means of which.

the grease may be manually forced if desired toward the inner end of thecylinder and out through a conducting tube 7 disposed at the inner endof the cylinder.

compression spring 8, tween the plug 3 andthe piston 2 concentric withthe push rod 5, so as'to. maintain a heavy lubricant such as-grease 9under slight pressure in the cylinder.

An-air cylinder '10 is fixed to the cylinder 1 'wit its axis. parallelthereto. The cylinder 10 is. slightly shorter than the cylinder 1 and oflesser diameter. A -tubular member 11 or passage member is connected atone 'end 12 with the outer end' of the oylinder.10.. The axis ofthemember 11 is inregistration with theaxis 9f the cylinder 10.

The conducting tube 7 is connected at its outer end with the passagemember 11 at a point intermediate the length of the member 11, wherebygrease 9 may be forced into'the passage member 11 due to pressure ofthespring 8. .A piston 13 is disposed within the air cylinder 10- and has-aplunger 1 1 secured thereto which extends into the passage member 11.The outermost end Y 15 of the plunger 14 is provided with a lip 16 whichnormally closes the mouth of the tubularconductor 7 when the piston isin a fully retracted position, as shown in Fig- The lip 16 has a slot 17therethrough, by means of which grease may enter the pasits fullyretracted position. A compression spring 18i's disposed concentric withthe plunger 14 between. the piston 13 and the inner wall 19 of thecylinder 10 whereby the piston 13 is yieldingly held in the positlonshown in Figure 1. Means for forcing the piston 13 toward the outer endof the cylinder, and thus forcing grease v posed in the passage 11, outthrough the mouth 20,0 the passagell is provided by is disposed bethendis sage 11 just prior to the piston 13 reaching admitting compressedair through the fie xible tube 21 to alve body member 222 This valvebody? member has two princlpal pas ages therethrough an'inlet passage 23and a discharge passage 24,'both communi mating with the cylinder10 bymeans of a co mmo passage 25% A plurlh'e r valve-25 is carried by thebody member/y22, and is normally held in the position shown in Figure 1by means of a compression spring 26 passed beneath the plunger andadjusted for pressure by the I provision of a threaded plug 27 member 22as tating manual operation of the valve plunger; The valve member 22 Iopening 33 therethrough,thereby providing Theplunger valve 25 has anannular rece ss "on its peripheraL wall shown at 28 at the upper end,which is in registratlon with the passage 24 and the diseharge port 29,when the device is in the posltion shown in Figure 1. i Q r The. plunger25' has a second annular erecess 30, similar to the recess 28, ad acentto the lower end which may be moved into registration with the passage23 and a passage '31 "communicating with the tube- 21 when the plunger25 is moved downwardly against t-he force of thespring 26. When sucli'movement occurs, the discharge passage-24 is closedby virtue of downwardmovement of that pa-rt Of the plunger containing the recess 28. I Theplunger 25 extends above the "valve shown at 32, thereby facilihas a,central a eonvenient means for holding the entire device by means of thevalve member as a handle.

From the foregoing description the ya,- rious' parts of the device, theoperation thereof maybe readily understood. 1 Prior 3 to using myimproved grease gun, 1t is necessary This is doneby "removall' o-f theplug 3, and.

to fill thecylinder 1 with grease 9.-

the piston 2. r 4

- The air tube 21 is then connected. with the valve member'22, as shownin Figure 1.

Pressure'is applied to the valve 25 so. as to.

move the recess 30 inregistration with the ,Thus air may enter theilc'ylinder 10 and force the piston toward the outer end of thecylinder. Movement of the plunger 14 by virtue of movement of theplunger 13 will cause the slot 17 of the'lip' 16 I-t0 register with'the.conducting member Tend grease 9 to be admitted to the passage 11. Thequantity of grease may be determined by the size of the spring 8 or bymanipulating the valve plunger 25 so as to hold the'plunger 14 in thisposition for a rho-- ment.

Continued pressure on the valve-25 will cause the piston 13 to movetothe outer end of the cylinder 10 and the plunger 14 will force grease9 in the passage 11 out through anv air cylinder,

the mouth 20 and into the grease cup, receptacle, fixture or the like.

The pressure is'then released from the 1 valve 25, permittingregistration of the recess 28 with the passage 2%:29. This time 9. Asthe slot 17 comesinto registration with the conducting member 7 freshgrease is admitted to the passage 11 and the device is ready for asecond complete'cycle of its operation.

lclaim: m

1. A pneumatic grease gun or the character described comprising a greasecontainer, a passage member adapted for connection with 'a'grease tubeor the like communicating with said container at itsremote end,

a piston in said air cylinder, a plunger carried by said .piston andarranged for movement through said passage member, means for admittingcompressed air to said cylinder for the actuation of said piston atwill, and means associated with said plunger for stopping the flow ofgrease into said passage member when said piston is fully retracted andfor permitting the movement of grease in said passageway when said.piston is at a point near full retraction, a

2. A pneumatic grease gun of-the character described comprising a greasecon-' the mouth of said conducting tube when said plunger isfullyretracted therebypreventing the movement of grease into saidpassage member,said lip havingan opening therethrough at the innermostend thereof,

whereby grease may pass through said opening from said conducting tubewhen said plunger, is slightly extended, and compressed air actuatedmeans for moving said plunger at will thereby forcing grease in saidpassage member through said grease tube or the like.

3. A pneumatic grease gun of the character described comprising a greasecontainer, a: passage member adapted for -connection with a grease tubeor the likecommunicating with said container at its remote end, an aircylinder, a piston in said air cylinder, a plunger carried by saidpiston and arranged for movement through said passage member, means foradmitting compressed air to said cylinder for theactuation of saidpiston at will, and means-associatedwith said plunger for stopping theflow of grease into said passage 'member when said piston is fullyretracted and for permitting the movement of grease into said passagewaywhen said piston is at a point near full retraction, said meansincluding a lip extending lon itudinally fromthe outermost end of saiplunger and having an opening therethrou-gh at a point adjacent to i theplunger.

CHARLES BRIDGEN LANSING.

